Developing a Modified Online Water Quality Index: A Case Study for Brazilian Reservoirs

Online approaches for monitoring water quality can be an alternative aid to rapid decision-making in watershed management, especially reservoirs, given their vulnerability the process of eutrophication. In this study, a modified index (WQI) was developed using parameters that are easily measured with sensors, which would allow online reservoirs. The WQI based on WQICETESB and we used regression models obtain values parameters: total phosphorus (TP), nitrogen (TN), biochemical oxygen demand (BOD) solids (TS). Water data from reservoirs 2003 2020 were used, provided by Environmental Company State São Paulo (CETESB), Brazil. adjusted employing weight redistribution (WQIRWAdj or WQISOL) presented most promising results, Pearson correlation 0.92 success rate 72.6% 97.0% CETESB simplified classifications, respectively. WQISOL, proposed present exhibited satisfactory performance, allowing monitored remotely real-time.